/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Parameterization/DynamicMeshUVEditor.h
Create new UV island for given Triangles, and set UVs by planar projection to ProjectionFrame. No transforms/etc are applied.
void SetPerTriangleUVs ( double ScaleFactor, [FUVEditResult](API\Plugins\DynamicMesh\Parameterization\FUVEditResult) * Result )